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Flyback & Forward Transformers

for Power over Ethernet

RoHS compliant halogen free AEC-Q flag


 
  • Flyback and forward transformers for PoE applications up to 72 W
  • Operates with 9 – 57 V input (POE21, 22, 24, 33, 35 and 38)
  • Operates with 33 – 57 V input (POE23, 30, 36, 53, 70 and 72)
  • Dual outputs can be configured as one single higher power output
  • AEC-Q200 Grade 1 (-40°C to +125°C)
Buy Now:
Count Unit price
1 $3.07
150 $2.79
300 $2.54
600 $2.30
1200 $1.92
2400 $1.75
5000 $1.59

For high volume or non-stock items, request a quote.

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Specifications

Electrical specifications at 25°C.

Flyback Transformers

Part number Power (W) Inductance
at 0A (µH) 1
Tolerance (%) Isat (A) 2 DCR max (mΩ) Leakage
Inductance
max (µH) 3
Turns Ratio Isolation
Voltage (Vrms) 5
Secondary
Output (V, A) 6
Pri Sec1 Sec2 Aux Pri : Sec1 : Sec2 : Aux
POE21PR-33E_ 21 21 10 6.2 31.0 10.0 10.0 80.0 0.30 1 : 0.231 : 0.231 : 0.692 1500 3.3 V , 3.2 A
POE22PR-50E_ 22 21 10 6.2 31.0 17.0 17.0 80.0 0.16 1 : 0.333 : 0.333 : 0.75 1500 5 V , 2.2 A
POE23PR-33E_ 23 54 10 3.2 62.0 6.5 6.5 58.0 0.67 1 : 0.125 : 0.125 : 0.375 1500 3.3 V , 3.5 A
POE24PR-12E_ 24 21 10 6.3 31.0 52.0 52.0 72.0 0.15 1 : 0.75 : 0.75 : 0.667 1500 12 V , 1 A
POE30PR-50E_ 30 48 10 3.6 62.0 10.0 10.0 85.0 0.40 1 : 0.188 : 0.188 : 0.375 1500 5 V , 3 A
POE36PR-12E_ 36 41 10 4.2 62.0 23.0 23.0 85.0 0.28 1 : 0.375 : 0.375 : 0.375 1500 12 V , 1.5 A

Forward Mode Transformers

Part number Power (W) Inductance
at 0A (µH) 1
Tolerance (%) DCR max (mΩ) Leakage
Inductance
max (µH) 3
Turns Ratio Volt-time
product (V-µs) 4
Isolation
Voltage (Vrms) 5
Secondary
Output (V, A) 6
Pri Sec1 Sec2 Aux Pri : Sec1 : Sec2 : Aux
POE33PR-33E_ 33 128 25 17.0 12.5 12.5 145 0.10 1 : 0.625 : 0.625 : 0.75 71 1500 3.3 V , 5 A
POE35PR-50E_ 35 128 15 17.6 23.0 23.0 340 0.15 1 : 0.875 : 0.875 : 1.75 71 1500 5 V , 3.5 A
POE38PR-12E_ 38 128 15 17.6 122 122 340 0.15 1 : 2.125 : 2.125 : 1.75 71 1500 12 V , 1.6 A
POE53PR-33E_ 53 100 15 30.0 6.5 6.5 120 0.40 1 : 0.167 : 0.167 : 0.5 107 1500 3.3 V , 8 A
POE70PR-50E_ 70 100 15 30.0 10.0 10.0 120 0.40 1 : 0.25 : 0.25 : 0.5 107 1500 5 V , 7 A
POE72PR-12E_ 72 100 15 38.0 27.0 27.0 120 0.25 1 : 0.583 : 0.583 : 0.5 107 1500 12 V , 3 A
Notes
  1. Inductance is for the primary, measured at 200 kHz, 0.1 Vrms, 0 Adc.
  2. DC current at 25°C that causes an inductance drop of < 30% from its value without current.
  3. Leakage inductance measured between pins 1 and 3 with all other pins shorted.
  4. Based on 280 mT at 25°C and number of turns on pins 1-3.
  5. 1500 Vrms, one minute isolation (hipot) from primary and auxillary to each secondary.
    500 Vrms from pri to aux; 500 Vrms between two secondary.
  6. Output is for each secondary. Output of the aux winding is 10 V, 50 mA.

Termination:

  • RoHS-compliant. 260°C compatible. Tin-silver-copper over tin over nickel
    over phos bronze terminations.

Packaging:

  • D = 13" machine-ready reel
    EIA 481 embossed plastic tape (150 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
Environmental
Environmental:
RoHS compliant , halogen free
Ambient temperature range:
–40°C to +125°C
Storage temperature range:
Component: –40°C to +165°C
Tape and reel packaging: –40°C to +80°C
Maximum part temperature:
+165°C (ambient + temp rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332

Performance curves

Inductance vs Current

Schematics

poexxprs.gif

Physical characteristics

poexxprd.gif

Tape and Reel specification

tapereel_pl.gif

 
Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
13" (330 mm) A B C D E W P Po P1 H T part_or_f.gif
150 330 100 13 50,4 44,4 44 28 4 2 14,6 0,5

General specification

Core Material:
Ferrite
Packaging:
150 per 13″ reel Plastic tape: 44 mm wide, 0.5 mm thick, 28 mm pocket spacing, 14.6 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.

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